Parallelogram
A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length. This means that the opposite sides of a parallelogram never intersect and are always the same length. Additionally, the opposite angles of a parallelogram are also equal.
Properties of a parallelogram:
- Opposite sides are parallel and equal in length.
- Opposite angles are equal.
- Consecutive angles are supplementary (add up to 180 degrees).
- Diagonals bisect each other (they intersect at their midpoints).
- The sum of the squares of the sides equals the sum of the squares of the diagonals (parallelogram law).
The area of a parallelogram can be calculated using the formula: Area = base * height, where the base is the length of any of its sides and the height is the perpendicular distance between the base and its opposite side.
.◂Math Worksheets and Study Guides Third Grade. Adding Money
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Adding Money 
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Adding Money Worksheet/Answer key
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Adding Money
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The resources above cover the following skills:
Algebra (NCTM)
Use mathematical models to represent and understand quantitative relationships.
Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.